Special device for fastening conductive cross arm screw

Abstract

The utility model discloses a special device for fastening a conductive cross arm screw, which comprises a vertical pipe body (1), an operation hole (2) arranged on the side wall of the pipe body (1), a bottom plate (3) arranged at the lower end of the pipe body (1), a support plate (4) arranged below the bottom plate (3), a tightening nut (5) arranged in the pipe body (1), an annular plate (6) arranged on the outer side of the tightening nut (5), and a plurality of pull rods (7) arranged between the annular plate (6) and the support plate (4). The pull rod (7) penetrates through the annular plate (6) and then is connected with a supporting plate (4), and a hydraulic cylinder (8) is arranged on the supporting plate (4). The upper end of the pull rod (7) extends outwards in the radial direction to form a cylindrical cap (10), the lower end of the pull rod (7) extends outwards in the radial direction to form a flat cap (11), and a via hole (12) matched with the flat cap (11) is formed in the supporting plate (4). The conductive arm base has the advantage that the conductive cross arm can be fixed on the conductive arm base more firmly.

Description

Technical Field

[0001] The utility model belongs to the field of electric arc furnaces, in particular to a special device for fastening a conductive horizontal arm screw of an electric arc furnace. Background Art

[0002] An electric arc furnace is an electric furnace that uses the high temperature generated by the electrode arc to melt ores and metals. The conductive cross arm is an important component of the electric arc furnace. The conductive cross arm is used to clamp and support the electrode and transmit electrical energy to the electrode to heat it up. The conductive cross arm is fixed to the upper end of the column through the conductive arm base.

[0003] like Figure 8 and Figure 9 As shown, the conductive cross arm of the electric arc furnace is fastened by screws and round nuts. Specifically, multiple screw seats are first welded inside the cross arm, and then the screws are taken on site. One end of the screw is tightened on the screw seat, and the other end of the screw passes through the conductive arm base. The screw is also covered with insulating pads, stainless steel gaskets and other accessories. Finally, the screw is manually tightened with a round nut to fix the conductive cross arm to the conductive arm base.

[0004] In practice, it was found that due to the large flatness matching tolerance problem among the insulating pad, stainless steel pad, conductive arm base, and conductive cross arm, the insulating pad and stainless steel pad may be distorted to a certain extent. When the round nut is used to lock the screw, there is a large elastic installation gap. The elastic installation gap cannot be completely eliminated by tightening the round nut manually, resulting in insufficient fixing strength of the conductive cross arm. In use, the conductive cross arm is frequently vibrated by external forces and is easy to loosen. The screw needs to be tightened frequently, which causes damage to the insulating pad. When the insulating pad is disassembled and replaced, the thread is easily damaged, causing damage to the screw or screw seat. In addition, since it is not easy to loosen the thread on the screw seat, the tightening force at the thread is large and lubricating loosening fluid cannot be added. After repeated forced disassembly and assembly, the thread will be damaged, resulting in failure or scrapping. Repair is difficult, downtime is time-consuming, and economic benefits are affected. Therefore, a device is needed to fix the conductive cross arm more firmly on the conductive arm base.

[0005] Therefore, the existing Utility Model Content

[0006] The purpose of the utility model is to provide a special device for fastening a screw rod of a conductive cross arm. The utility model has the advantage of being able to more firmly fix the conductive cross arm on the conductive arm base.

[0007] The technical solution of the utility model is: a special device for tightening a conductive cross arm screw, comprising a vertical tube body, an operating hole is provided on the side wall of the tube body, a bottom plate is provided at the lower end of the tube body, a support plate is provided below the bottom plate, a tightening nut is provided inside the tube body, a ring plate is provided on the outside of the tightening nut, a plurality of circumferentially distributed bolts are provided between the ring plate and the support plate, the bolts pass through the ring plate and are connected to the support plate, and a hydraulic cylinder is provided on the support plate.

[0008] In the aforementioned conductive cross arm screw fastening device, the upper end of the pull rod extends radially outward to form a cylindrical head located on the upper side of the ring plate, and the lower end of the pull rod extends radially outward to form a flat head located on the lower side of the support plate, and the support plate is provided with a through hole that cooperates with the flat head.

[0009] In the aforementioned dedicated device for tightening the conductive cross arm screw, three notches are provided on the outer peripheral surface of the ring plate, and bolts for connecting the support plate are provided in the notches.

[0010] In the aforementioned dedicated device for tightening the conductive cross arm screw, the ring plate is located at the lower end of the tightening nut.

[0011] In the aforementioned dedicated device for tightening the conductive cross arm screw, the hydraulic cylinder is a manual thin hydraulic cylinder.

[0012] Compared to the prior art, the present invention connects the lower end of the screw by tightening the nut, and generates two forces in opposite directions through the hydraulic cylinder: one is a downward pulling force acting on the conductive cross arm, and the other is an upward force. Utilizing the powerful hydraulic pressure of the hydraulic cylinder, the elastic installation gap is first eliminated, and then the round nut is tightened, which greatly improves the fixing strength of the conductive cross arm to the conductive arm base, preventing the conductive cross arm from loosening during use. Therefore, the present invention has the advantage of being able to fix the conductive cross arm to the conductive arm base more firmly.

[0013] In addition, through further structural improvements, the utility model has the advantages of easy operation and easy assembly, while having a simple structure and relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view schematic diagram of the present utility model.

[0015] Figure 2 Schematic diagram of the top view of the tension nut.

[0016] Figure 3 It is a top view schematic diagram of the base plate.

[0017] Figure 4 It is a schematic front view of the tube body.

[0018] Figure 5 It is a top view schematic diagram of the tube body.

[0019] Figure 6 Schematic diagram of the top view of the support plate.

[0020] Figure 7 It is a top view of the flat head.

[0021] Figure 8 It is a front view schematic diagram of the connection structure between the conductive cross arm and the column.

[0022] Figure 9 It is a left view schematic diagram of the connection structure between the conductive cross arm and the column.

[0023] Figure 10 This is a usage state diagram of the utility model.

[0024] The marks in the accompanying drawings are: 1-tube body, 2-operation hole, 3-bottom plate, 4-support plate, 5-tightening nut, 6-ring plate, 7-pull rod, 8-hydraulic cylinder, 9-notch, 10-cylindrical head, 11-flat head, 12-through hole, 13-column, 14-conductive arm base, 15-mica plate, 16-mica gasket, 17-stainless steel gasket, 18-round nut, 19-screw, 20-conductive cross arm, 21-mica sleeve. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0026] Embodiment. A dedicated device for tightening a conductive cross arm screw, such as Figures 1 to 7 As shown, it includes a vertical tube body 1, three circumferentially evenly distributed operating holes 2 are provided on the side wall of the tube body 1, a bottom plate 3 is provided at the lower end of the tube body 1, a support plate 4 is provided below the bottom plate 3, a tightening nut 5 is provided in the tube body 1, a ring plate 6 is provided on the outside of the tightening nut 5, the ring plate 6 is located at the lower end of the tightening nut 5, and three circumferentially evenly distributed notches 9 are provided on the outer peripheral surface of the ring plate 6, a pull rod 7 connected to the support plate 4 is provided in the notch 9, and the pull rod 7 passes through the ring plate 6 and is connected to the support plate 4, a hydraulic cylinder 8 is provided on the support plate 4, and the output end of the hydraulic cylinder 8 faces the bottom plate 3, and the hydraulic cylinder 8 is a manual thin hydraulic cylinder.

[0027] The upper end of the tie rod 7 extends radially outward to form a cylindrical protrusion 10 located on the upper side of the ring plate 6. The lower end of the tie rod 7 extends radially outward to form a flat protrusion 11 located on the lower side of the support plate 4. The support plate 4 is provided with a through hole 12 that cooperates with the flat protrusion 11. When the length of the flat protrusion 11 is aligned with the length of the through hole 12, the tie rod 7 can be withdrawn upward to separate the support plate 4.

[0028] The connection structure of the conductive cross arm 20 on the column 13 is as follows: Figure 8 and Figure 9As shown, a transverse conductive arm base 14 is welded to the upper end of the column 13. A mica plate 15 is positioned between the conductive arm base 14 and the conductive cross arm 20. A 40 mm thick mica gasket 16, a stainless steel gasket 17, and a round nut 18 are positioned on the underside of the conductive arm base 14. A screw 19 is also included. The upper end of screw 19 passes through the round nut 18, stainless steel gasket 17, mica gasket 16, conductive arm base 14, and mica plate 15, and is then screwed to the conductive cross arm 20. A mica sleeve 21 is positioned on the outer side of screw 19. The upper end of mica sleeve 21 is positioned between the upper and lower bottom surfaces of mica plate 15, and the lower end of mica sleeve 21 is aligned with the top surface of stainless steel gasket 17. Mica sleeve 21 is 320 mm long. The combination of mica plate 15, mica gasket 16, and mica sleeve 21 prevents current from the conductive cross arm 20 from flowing toward the column.

[0029] Under the existing technology, the round nut 18 is tightened manually, but due to the elastic installation gap between the mica plate 15, the mica gasket 16, the stainless steel gasket 17, and the conductive arm base 14, the round nut 18 cannot actually be completely tightened into place, the elastic installation gap cannot be completely eliminated, and the tightening force of the screw 19 is insufficient, so it becomes loose after being used for a period of time.

[0030] The screw 19 is tightened using the dedicated device in the embodiment: the tensioning nut 5 is connected to the lower end of the screw 19, the upper end of the tube body 1 is close to the stainless steel gasket 17, and the hydraulic cylinder 8 is started. The pressure of the hydraulic cylinder 8 is 6-8 MPa. The hydraulic cylinder 8 presses the bottom plate 3 upward, and the bottom plate 3 presses the tube body 1 against the stainless steel gasket 17, forming an upward force on the stainless steel gasket 17. The reaction force of the hydraulic cylinder 8 acts on the conductive cross arm 20 through the support plate 4, the pull rod 7, the tensioning nut 5, and the screw 19, creating a downward force on the conductive cross arm 20. The stainless steel gasket 17 is upward and the conductive cross arm 20 is downward, eliminating the elastic installation gap between the mica plate 15, the mica gasket 16, the stainless steel gasket 17, and the conductive arm base 14. Under the pressure-maintaining state, the round nut 18 can be tightened with a wrench to achieve a secure installation of the conductive cross arm 20.

[0031] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

Claims

1. A special device for tightening a conductive cross arm screw, characterized by: The invention comprises a vertical tube body (1), an operating hole (2) is provided on the side wall of the tube body (1), a bottom plate (3) is provided at the lower end of the tube body (1), a support plate (4) is provided below the bottom plate (3), a tightening nut (5) is provided inside the tube body (1), a ring plate (6) is provided on the outer side of the tightening nut (5), a plurality of circumferentially distributed pull rods (7) are provided between the ring plate (6) and the support plate (4), the pull rods (7) pass through the ring plate (6) and are connected to the support plate (4), and a hydraulic cylinder (8) is provided on the support plate (4).

2. The conductive cross arm screw fastening device according to claim 1, characterized in that: The upper end of the pull rod (7) extends radially outward to form a cylindrical head (10) located on the upper side of the ring plate (6), and the lower end of the pull rod (7) extends radially outward to form a flat head (11) located on the lower side of the support plate (4). The support plate (4) is provided with a through hole (12) that cooperates with the flat head (11).

3. The dedicated device for tightening the conductive cross arm screw according to claim 1, characterized in that: Three notches (9) are provided on the outer peripheral surface of the ring plate (6), and pull rods (7) connected to the support plate (4) are provided in the notches (9).

4. The dedicated device for tightening the conductive cross arm screw according to claim 1, characterized in that: The ring plate (6) is located at the lower end of the tightening nut (5).

5. The dedicated device for tightening the conductive cross arm screw according to claim 1, characterized in that: The hydraulic cylinder (8) is a manual thin hydraulic cylinder.

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